CVE-2023-40015 Information

Description

Vyper is a Pythonic Smart Contract Language. For the following (probably non-exhaustive) list of expressions the compiler evaluates the arguments from right to left instead of left to right. unsafe_add unsafe_sub unsafe_mul unsafe_div pow_mod256 | & ^ (bitwise operators) bitwise_or (deprecated) bitwise_and (deprecated) bitwise_xor (deprecated) raw_call < > <= >= == != in not in (when lhs and rhs are enums). This behaviour becomes a problem when the evaluation of one of the arguments produces side effects that other arguments depend on. The following expressions can produce side-effect: state modifying external call state modifying internal call raw_call pop() when used on a Dynamic Array stored in the storage create_minimal_proxy_to create_copy_of create_from_blueprint. This issue has not yet been patched. Users are advised to make sure that the arguments of the expression do not produce side effects or if one does that no other argument is dependent on those side effects.

Reference

https://github.com/vyperlang/vyper/security/advisories/GHSA-g2xh-c426-v8mf